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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Transportation
Mar. 31, 2012
Facilities
Dec. 31, 2011
Facilities
Mar. 31, 2012
Supply and Logistics
Changes in goodwill          
Balance at beginning of period $ 1,854 $ 818 $ 609 $ 609 $ 427
Acquisitions 10 10      
Foreign currency translation adjustments 5 4     1
Purchase price accounting adjustments and other 10 10      
Balance at end of period 1,879 842 609 609 428
Accumulated impairment losses $ 3